Automatic valve.



Patented Dec. I7, I901.

(No Model.)

JM JM WTIRQ UNITED STATES ATENT FFICE.

WILLIAM J. COLLINS, OF NEW BEDFORD, MASSACHUSETTS, ASSIGNOR TO NE W BEDFORD BOILER & MACHINE 00., OF NEW BEDFORD, MASSACHUSETTS.

AUTOMATIC VALVE.

SPECIFICATION forming part of Letters Patent No. 688,830, dated December 17, 1901. Application filed AugustlZ, 1901. Serial No. 71,878- (No model.)

To all whom it may concern:

Be it known that I, WILLIAM J. COLLINS, a citizen of the United States of America, residing at New Bedford, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improvements in Automatic Valves, of which the following is a specification.

My invention relates particularly to valves used in the pipes leading from the separate boilers of a battery of boilers to the steammain; and its object is to provide a valve for such use which when the steam-pressure in any one of said battery of boilers falls below that of the others, because of an accident to said boiler or from any other cause, will automaticall y close,and that when the steam-pressure in said boiler rises to the same degree of the other boilers will automatically open.

A further object of my invention is to provide means whereby the valve in its automatic action shall open and close gradually, so that the valve or its seat shall not be inj ured thereby.

To this end my invention consists in a valve having its upper surface provided with a piston, and a cylinder attached to the valve-stem adapted to receive said valve-piston and provided with a small aperture in its bottom, whereby the valve is caused to move slowly to or from its seat.

The accompanying drawing,which is a view of my improved automatic valve in longitudinal vertical section, illustrates my invention.

The numeral 1 represents the valve body or shell.

2 is the valve, having the guide 3 and its upper surface provided with the valve-piston l.

5 is a cylinder attached to and movable with the valve-stem, having the small aperture 6 in its bottom and adapted to receive the valvepiston 4.

The operation of the device is as follows, it being observed that one of the above-described valves is situated in the steam-pipe leading from each one of a battery of boilers to the steam-main: When the steam-pressure in any one of a battery of boilers falls below the pressure in the steam-main, the valve in the steam-pipe leading from that boiler is closed by the back pressure of the steam in the main on the upper surface of the valve and it is caused toclose slowly, because the vacuum formed in the cylinder 5 by the partial closing of the valve can only be filled slowly through the small orifice 6. The valve opens slowly because the steam or air which fills the cylinder when the valve is closed can only escape slowly through the small aperture 6.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-- An automatic valve, comprising a valvebody having a valve-seat; a valve operating in conjunction with said seat, having its upper surface provided with a piston; a cylinder attached to the valve-stem adapted to receive said valve-piston, and provided with a small aperture in its bottom, substantially as shown, and for the purpose described.

Signed by me at New Bedford, Massachusetts, this 24th day of April, 1901.

WILLIAM J. COLLINS.

Witnesses:

EDWARD P. HASKELL, HENRY W. MASON. 

